ABUDAWUD 2323:
from ʿAbd al-Raḥman b. Abū Bakrah from his father —
The Prophet ﷺ as saying: The two months of 'Id (festival), Ramadan and Dhu al-Hijjah, are not defective.
أبو داود ٢٣٢٣:
عن عبد الرحمن بن ابو بكره عن أبيه —
عَنِ النَّبِيِّ ﷺ قَالَ شَهْرَا عِيدٍ لاَ يَنْقُصَانِ رَمَضَانُ وَذُو الْحِجَّةِ